Creamy Garlic Parmesan Scalloped Potatoes

When it comes to holiday feasts and Sunday family roasts, no side dish commands the table quite like these creamy garlic Parmesan scalloped potatoes. Layered with paper-thin Yukon gold potatoes bathed in a velvety garlic-herb béchamel, nutty aged Parmesan, and gooey Gruyere cheese, this gratin bakes into a bubbling, golden masterpiece with crispy caramelized edges and fork-tender centers.

While basic scalloped potatoes can sometimes suffer from watery sauces or undercooked potato slices, our method uses a mandoline for precision ⅛-inch cuts and pre-thickens the garlic cream sauce before assembling. Pair this luxurious gratin alongside our Thanksgiving favorite loaded sweet potato casserole with pecans or serve beside our succulent tender slow cooker beef pot roast for a feast your guests will reminisce about for years.

Why You’ll Love This Recipe

• Velvety Sauce That Never Splits: Using heavy cream with a light butter roux guarantees an ultra-luxurious sauce that stays silky and never curdles into oil.
• Crunchy Golden Cheese Crown: Freshly grated Parmesan and Gruyere broil into a deeply savory, crispy browned crust on top.
• Make-Ahead Friendly: Assemble the casserole up to 24 hours in advance, chill covered in the refrigerator, and bake right before dinner.
• The Ultimate Holiday Crowd-Pleaser: Comforting, rich, and naturally vegetarian, making it an indispensable side dish for holiday hosting.

Key Ingredients & Smart Swaps

• Yukon Gold Potatoes: Naturally buttery, creamy, and hold their layered structure without turning to mush. Russet potatoes also work well for extra starchiness.
• Fresh Garlic: Four cloves of fresh minced garlic gently sautéed in butter create an aromatic foundation that permeates every layer.
• Heavy Cream & Whole Milk: The optimal dairy fat blend to ensure a thick, rich sauce that clings to the potatoes.
• Parmesan & Gruyere: Parmesan lends salty umami depth while Gruyere melts into stretchy, nutty decadence.
• A Pinch of Ground Nutmeg: The quintessential French seasoning secret that brings warmth and cuts through heavy dairy richness.

Step-by-Step Cooking Walkthrough

1. Mandoline Slicing: Slice peeled potatoes ⅛-inch thin. Do not rinse or soak them—their surface starch is needed to bind the cream sauce.

2. Whisk Garlic Béchamel: Cook butter, garlic, and flour for 90 seconds. Whisk in cream, milk, seasonings, and half the cheese until silky.

3. Layer & Top: Layer potatoes and sauce in three tiers in a buttered baking dish. Top with remaining Parmesan and Gruyere.

4. Two-Phase Bake: Bake covered with foil at 375°F (190°C) for 45 minutes, then uncover and bake 20 to 25 minutes until bubbling and crisp.

3 Chef Secrets for Perfect Results

1. Never Rinse the Potatoes: Many potato recipes call for soaking to remove starch, but scalloped potatoes need that natural potato starch to thicken the cream and prevent a separated sauce.

2. Uniform Slicing with a Mandoline: Slicing by hand results in uneven thicknesses where some slices turn mushy while others remain raw. A mandoline slicer ensures every single slice bakes simultaneously.

3. Rest for 15 Minutes Before Cutting: Straight from the oven, the sauce is molten and runny. Resting 15 minutes allows the potato starches to firm up so you can cut clean, beautiful gratin squares.

What to Serve With Scalloped Potatoes

• Holiday Centerpiece Proteins: The classic pairing for roasted turkey breast, prime rib roast, or glazed holiday meats.
• Crisp Green Salad: A simple arugula salad with lemon vinaigrette cuts through the rich garlic cream beautifully.
• Steamed Vegetables: Sautéed garlic green beans, roasted Brussels sprouts, or buttered asparagus provide vibrant color.

Storage, Freezing & Reheating Instructions

• Refrigeration: Cover leftovers tightly with foil or transfer to an airtight container and refrigerate for up to 4 days.
• Gentle Reheating: Reheat covered with foil in a 350°F (175°C) oven for 20 minutes until heated through. Remove foil for the last 5 minutes to restore the crispy cheese crust.
• Freezing: Freezing fully baked scalloped potatoes is possible, though the dairy may soften slightly upon thawing. Reheat straight from frozen at 350°F covered for 45 minutes.

Creamy Garlic Parmesan Scalloped Potatoes

Ultra-rich, decadent scalloped potatoes layered with tender Yukon gold slices, roasted garlic cream, nutty Parmesan, and melted Gruyere baked until bubbling and golden brown.

Print Recipe Pin Recipe

Prep Time 25 minutes mins

Cook Time 1 hour hr 10 minutes mins

Total Time 1 hour hr 35 minutes mins

Servings: 10 generous portions

Calories: 390

Ingredients Method Nutrition Notes

Ingredients

  

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Tender Potato Layers

• 3 lbs Yukon gold or Russet potatoes peeled and sliced ⅛-inch thin with a mandoline
• 1 small yellow onion finely diced or paper-thin sliced

Velvety Garlic Cream Sauce & Cheeses

• 4 tablespoon unsalted butter
• ¼ cup all-purpose flour
• 4 cloves garlic finely minced
• 2 cups heavy cream
• 1 ½ cups whole milk or low-sodium chicken broth
• 1 ½ cups Parmesan cheese freshly grated from wedge
• 1 ½ cups Gruyere or sharp white cheddar cheese freshly shredded
• 1 teaspoon fresh thyme leaves
• ¼ teaspoon ground nutmeg essential French bistro note
• 1 ½ teaspoon kosher salt
• ½ teaspoon freshly cracked black pepper
• 2 tablespoon fresh chives or parsley chopped for garnish

Method

 

Slice Potatoes & Simmer Garlic Cream

1. Prep Dish & Potatoes: Preheat oven to 375°F (190°C). Grease a 9x13-inch ceramic baking dish with butter. Slice potatoes into uniform ⅛-inch slices using a mandoline.
2. Make Garlic Roux: In a medium saucepan, melt butter over medium heat. Add minced garlic and cook for 1 minute until fragrant. Whisk in flour and cook for 90 seconds until bubbly.
3. Simmer Velvety Cream Sauce: Slowly pour in heavy cream and whole milk (or broth) while whisking constantly to prevent lumps. Whisk in kosher salt, pepper, thyme, and nutmeg. Simmer for 3 to 4 minutes until thickened. Remove from heat and stir in 1 cup of Parmesan and 1 cup of Gruyere until silky and melted.

Layer & Bake to Golden Bubble

1. Layer Casserole: Spread ½ cup of sauce into the bottom of the dish. Arrange ⅓ of the potato slices in overlapping rows, scatter some onion, and ladle ⅓ of the cream sauce over top. Repeat for two more layers, finishing with the remaining sauce.
2. Top With Cheeses: Scatter remaining ½ cup Parmesan and ½ cup Gruyere evenly across the top.
3. Bake Covered then Uncovered: Cover dish tightly with aluminum foil and bake at 375°F for 45 minutes until potatoes are knife-tender. Remove foil and bake uncovered for another 20 to 25 minutes until the top is bubbling, deep golden brown, and crisp around the edges.
4. Rest & Garnish: Allow to rest for 15 minutes before serving so the luscious garlic cream sets into sliceable layers. Garnish with fresh chives and enjoy!

Nutrition

Serving: 1gCalories: 390kcalCarbohydrates: 34gProtein: 10gFat: 25gSaturated Fat: 15gPolyunsaturated Fat: 1gMonounsaturated Fat: 7gCholesterol: 75mgSodium: 490mgPotassium: 680mgFiber: 3gSugar: 4gVitamin A: 820IUVitamin C: 22mgCalcium: 280mgIron: 1.6mg

Notes

Do not soak sliced potatoes in water! The natural surface starch is essential to bind with the cream sauce into a velvety gratin that never splits. Resting 15 minutes before cutting allows clean, gorgeous square slices.

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Frequently Asked Questions

What is the difference between scalloped potatoes and potatoes au gratin?
Traditionally, scalloped potatoes are baked in cream without cheese, while au gratin includes cheese between layers and on top. This recipe combines the best of both worlds with a rich garlic cream sauce and plenty of melted cheese!

Can I make this ahead of time?
Yes! Assemble completely, cover tightly with plastic wrap and foil, and refrigerate for up to 24 hours. Remove plastic wrap, re-cover with foil, and bake as directed, adding 5 to 10 minutes to the covered bake time.

Can I leave the potato skins on?
If using thin-skinned Yukon gold potatoes, you can leave the skins on for a rustic finish. If using Russets, peeling is recommended due to their thicker, coarser skins.

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